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overlay: Use the new i915 PMU to query GPU busyness

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And so avoid having to hold forcewake indefinitely.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2013-08-20 19:11:44 +01:00
parent 5cb8c77d69
commit 2e482a3487
2 changed files with 215 additions and 49 deletions
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251
overlay/gpu-top.c
View File

@ -1,8 +1,11 @@
#include <linux/perf_event.h>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include "igfx.h"
#include "gpu-top.h"
@ -14,52 +17,156 @@
#define RING_WAIT (1<<11)
#define RING_WAIT_SEMAPHORE (1<<10)
struct ring {
#define __I915_PERF_RING(n) (4*n)
#define I915_PERF_RING_BUSY(n) (__I915_PERF_RING(n) + 0)
#define I915_PERF_RING_WAIT(n) (__I915_PERF_RING(n) + 1)
#define I915_PERF_RING_SEMA(n) (__I915_PERF_RING(n) + 2)
static int
perf_event_open(struct perf_event_attr *attr,
pid_t pid,
int cpu,
int group_fd,
unsigned long flags)
{
#ifndef __NR_perf_event_open
#if defined(__i386__)
#define __NR_perf_event_open 336
#elif defined(__x86_64__)
#define __NR_perf_event_open 298
#else
#define __NR_perf_event_open 0
#endif
#endif
attr->size = sizeof(*attr);
return syscall(__NR_perf_event_open, attr, pid, cpu, group_fd, flags);
}
static uint64_t i915_type_id(void)
{
char buf[1024];
int fd, n;
fd = open("/sys/bus/event_source/devices/i915/type", 0);
if (fd < 0)
return 0;
n = read(fd, buf, sizeof(buf)-1);
close(fd);
if (n < 0)
return 0;
buf[n] = '\0';
return strtoull(buf, 0, 0);
}
static int perf_i915_open(int config, int group)
{
struct perf_event_attr attr;
memset(&attr, 0, sizeof (attr));
attr.type = i915_type_id();
if (attr.type == 0)
return -ENOENT;
attr.config = config;
attr.freq = 1;
attr.sample_freq = 1000;
attr.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED;
if (group == -1)
attr.read_format |= PERF_FORMAT_GROUP;
return perf_event_open(&attr, -1, 0, group, 0);
}
static int perf_init(struct gpu_top *gt)
{
const char *names[] = {
"render",
"bitstream",
"bliter",
NULL,
};
int n;
gt->fd = perf_i915_open(I915_PERF_RING_BUSY(0), -1);
if (gt->fd < 0)
return -1;
if (perf_i915_open(I915_PERF_RING_WAIT(0), gt->fd) >= 0)
gt->have_wait = 1;
if (perf_i915_open(I915_PERF_RING_SEMA(0), gt->fd) >= 0)
gt->have_sema = 1;
gt->ring[0].name = names[0];
gt->num_rings = 1;
for (n = 1; names[n]; n++) {
if (perf_i915_open(I915_PERF_RING_BUSY(n), gt->fd) >= 0) {
if (gt->have_wait &&
perf_i915_open(I915_PERF_RING_WAIT(n), gt->fd) < 0)
return -1;
if (gt->have_sema &&
perf_i915_open(I915_PERF_RING_SEMA(n), gt->fd) < 0)
return -1;
gt->ring[gt->num_rings++].name = names[n];
}
}
return 0;
}
struct mmio_ring {
int id;
uint32_t mmio;
uint32_t base;
void *mmio;
int idle, wait, sema;
};
static void *mmio;
static uint32_t ring_read(struct ring *ring, uint32_t reg)
static uint32_t mmio_ring_read(struct mmio_ring *ring, uint32_t reg)
{
return igfx_read(mmio, ring->mmio + reg);
return igfx_read(ring->mmio, reg);
}
static void ring_init(struct ring *ring)
static void mmio_ring_init(struct mmio_ring *ring, void *mmio)
{
uint32_t ctl;
ctl = ring_read(ring, RING_CTL);
ring->mmio = (char *)mmio + ring->base;
ctl = mmio_ring_read(ring, RING_CTL);
if ((ctl & 1) == 0)
ring->id = -1;
}
static void ring_reset(struct ring *ring)
static void mmio_ring_reset(struct mmio_ring *ring)
{
ring->idle = 0;
ring->wait = 0;
ring->sema = 0;
}
static void ring_sample(struct ring *ring)
static void mmio_ring_sample(struct mmio_ring *ring)
{
uint32_t head, tail, ctl;
if (ring->id == -1)
return;
head = ring_read(ring, RING_HEAD) & ADDR_MASK;
tail = ring_read(ring, RING_TAIL) & ADDR_MASK;
head = mmio_ring_read(ring, RING_HEAD) & ADDR_MASK;
tail = mmio_ring_read(ring, RING_TAIL) & ADDR_MASK;
ring->idle += head == tail;
ctl = ring_read(ring, RING_CTL);
ctl = mmio_ring_read(ring, RING_CTL);
ring->wait += !!(ctl & RING_WAIT);
ring->sema += !!(ctl & RING_WAIT_SEMAPHORE);
}
static void ring_emit(struct ring *ring, int samples, union gpu_top_payload *payload)
static void mmio_ring_emit(struct mmio_ring *ring, int samples, union gpu_top_payload *payload)
{
if (ring->id == -1)
return;
@ -69,28 +176,26 @@ static void ring_emit(struct ring *ring, int samples, union gpu_top_payload *pay
payload[ring->id].u.sema = 100 * ring->sema / samples;
}
void gpu_top_init(struct gpu_top *gt)
static void mmio_init(struct gpu_top *gt)
{
struct ring render_ring = {
.mmio = 0x2030,
struct mmio_ring render_ring = {
.base = 0x2030,
.id = 0,
}, bsd_ring = {
.mmio = 0x4030,
.base = 0x4030,
.id = 1,
}, bsd6_ring = {
.mmio = 0x12030,
.base = 0x12030,
.id = 1,
}, blt_ring = {
.mmio = 0x22030,
.base = 0x22030,
.id = 2,
};
const struct igfx_info *info;
struct pci_device *igfx;
void *mmio;
int fd[2], i;
memset(gt, 0, sizeof(*gt));
gt->fd = -1;
igfx = igfx_get();
if (!igfx)
return;
@ -105,6 +210,7 @@ void gpu_top_init(struct gpu_top *gt)
default:
fcntl(fd[0], F_SETFL, fcntl(fd[0], F_GETFL) | O_NONBLOCK);
gt->fd = fd[0];
gt->type = MMIO;
gt->ring[0].name = "render";
gt->num_rings = 1;
if (info->gen >= 040) {
@ -124,54 +230,101 @@ void gpu_top_init(struct gpu_top *gt)
mmio = igfx_get_mmio(igfx);
ring_init(&render_ring);
mmio_ring_init(&render_ring, mmio);
if (info->gen >= 060) {
ring_init(&bsd6_ring);
ring_init(&blt_ring);
mmio_ring_init(&bsd6_ring, mmio);
mmio_ring_init(&blt_ring, mmio);
} else if (info->gen >= 040) {
ring_init(&bsd_ring);
mmio_ring_init(&bsd_ring, mmio);
}
for (;;) {
union gpu_top_payload payload[MAX_RINGS];
ring_reset(&render_ring);
ring_reset(&bsd_ring);
ring_reset(&bsd6_ring);
ring_reset(&blt_ring);
mmio_ring_reset(&render_ring);
mmio_ring_reset(&bsd_ring);
mmio_ring_reset(&bsd6_ring);
mmio_ring_reset(&blt_ring);
for (i = 0; i < 1000; i++) {
ring_sample(&render_ring);
ring_sample(&bsd_ring);
ring_sample(&bsd6_ring);
ring_sample(&blt_ring);
mmio_ring_sample(&render_ring);
mmio_ring_sample(&bsd_ring);
mmio_ring_sample(&bsd6_ring);
mmio_ring_sample(&blt_ring);
usleep(1000);
}
ring_emit(&render_ring, 1000, payload);
ring_emit(&bsd_ring, 1000, payload);
ring_emit(&bsd6_ring, 1000, payload);
ring_emit(&blt_ring, 1000, payload);
mmio_ring_emit(&render_ring, 1000, payload);
mmio_ring_emit(&bsd_ring, 1000, payload);
mmio_ring_emit(&bsd6_ring, 1000, payload);
mmio_ring_emit(&blt_ring, 1000, payload);
write(fd[1], payload, sizeof(payload));
}
}
void gpu_top_init(struct gpu_top *gt)
{
memset(gt, 0, sizeof(*gt));
gt->fd = -1;
if (perf_init(gt) == 0)
return;
mmio_init(gt);
}
int gpu_top_update(struct gpu_top *gt)
{
uint32_t data[1024];
int len, update = 0;
int update, len;
if (gt->fd < 0)
return update;
return 0;
if (gt->type == PERF) {
struct gpu_top_stat *s = &gt->stat[gt->count++&1];
struct gpu_top_stat *d = &gt->stat[gt->count&1];
uint64_t *sample, d_time;
int n;
len = read(gt->fd, data, sizeof(data));
if (len < 0)
return 0;
sample = (uint64_t *)data + 1;
s->time = *sample++;
for (n = 0; n < gt->num_rings; n++) {
s->busy[n] = sample[n];
if (gt->have_wait)
s->wait[n] = sample[n];
if (gt->have_sema)
s->sema[n] = sample[n];
}
if (gt->count == 1)
return 0;
d_time = s->time - d->time;
for (n = 0; n < gt->num_rings; n++) {
gt->ring[n].u.u.busy = 100 * (s->busy[n] - d->busy[n]) / d_time;
if (gt->have_wait)
gt->ring[n].u.u.wait = 100 * (s->wait[n] - d->wait[n]) / d_time;
if (gt->have_sema)
gt->ring[n].u.u.sema = 100 * (s->sema[n] - d->sema[n]) / d_time;
}
while ((len = read(gt->fd, data, sizeof(data))) > 0) {
uint32_t *ptr = &data[len/sizeof(uint32_t) - MAX_RINGS];
gt->ring[0].u.payload = ptr[0];
gt->ring[1].u.payload = ptr[1];
gt->ring[2].u.payload = ptr[2];
gt->ring[3].u.payload = ptr[3];
update = 1;
} else {
while ((len = read(gt->fd, data, sizeof(data))) > 0) {
uint32_t *ptr = &data[len/sizeof(uint32_t) - MAX_RINGS];
gt->ring[0].u.payload = ptr[0];
gt->ring[1].u.payload = ptr[1];
gt->ring[2].u.payload = ptr[2];
gt->ring[3].u.payload = ptr[3];
update = 1;
}
}
return update;

13
overlay/gpu-top.h
View File

@ -3,8 +3,13 @@
#include <stdint.h>
struct gpu_top {
enum { PERF, MMIO } type;
int fd;
int num_rings;
int have_wait;
int have_sema;
struct gpu_top_ring {
const char *name;
union gpu_top_payload {
@ -16,6 +21,14 @@ struct gpu_top {
uint32_t payload;
} u;
} ring[MAX_RINGS];
struct gpu_top_stat {
uint64_t time;
uint64_t busy[MAX_RINGS];
uint64_t wait[MAX_RINGS];
uint64_t sema[MAX_RINGS];
} stat[2];
int count;
};
void gpu_top_init(struct gpu_top *gt);